| 摘要 |
PURPOSE:To obtain always proper outputs by interrupting the incidence of light to the surface of photoelectric conversion when the quantity measured by a photometric means reaches a prescribed level. CONSTITUTION:Synchronously with the output of a synchronizing signal generating circuit SG, a clock generator CG forms various pulses and a clock driver CD drives CCD. Simultaneously with said operation, a shutter driving circuit SDR is set up and a shutter SH is opened. When the load of a photometric picture element exceeds a prescribed value, a pulse is outputted from a detecting circuit DET and the shutter driving circuit SDR is reset. Consequently, the shutter SH is closed and light incidence to an image pickup element is interrupted. |
